Desa BLUE-FLAME A Operation And Installation Manual
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Desa BLUE-FLAME A Operation And Installation Manual

Blue-flame vent-free natural gas heater 18,000 btu/hr non-thermostat, 18,000 btu/hr thermostat, and 28,000 btu/hr thermostat “a” model heaters
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BLUE-FLAME VENT-FREE
NATURAL GAS HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
Heater Sizes: 18,000 BTU/Hr Non-Thermostat,
18,000 BTU/Hr Thermostat, and 28,000 BTU/Hr Thermostat
WARNING: If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the
gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be performed by a qualified installer, service
agency, or the gas supplier.
"A" Model Heaters
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  • Page 1 BLUE-FLAME VENT-FREE NATURAL GAS HEATER OWNER’S OPERATION AND INSTALLATION MANUAL Heater Sizes: 18,000 BTU/Hr Non-Thermostat, 18,000 BTU/Hr Thermostat, and 28,000 BTU/Hr Thermostat WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. —...

  • Page 2: Table Of Contents

    CONTENTS SAFETY INFORMATION SECTION Safety Information ... 2 Product Identification ... 4 Local Codes ... 4 Unpacking ... 4 Product Features ... 4 Fresh Air For Combustion And Ventilation ... 5 Installing To Wall ... 9 Connecting To Gas Supply ... 14 Checking Gas Connections ...
  • Page 3 SAFETY INFORMATION Continued 099569 WARNINGS WARNING ICON G 001 WARNING: Any change to this heater or its controls can be dangerous. 1. Use only natural gas. Do not convert heater to use different fuel type. 2. If you smell gas •...

  • Page 4: Product Identification

    PRODUCT IDENTIFICATION LOCAL CODES UNPACKING PRODUCT FEATURES Front Panel Figure 1 - Vent-Free Natural Gas Heater (28,000 BTU/Hr Model Shown) Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of the National Fuel Gas Code ANSI Z223, also known as NFPA 54*.

  • Page 5: Fresh Air For Combustion And Ventilation

    FRESH AIR COMBUSTION VENTILATION 099569 WARNING ICON G 001 This heater must have fresh air for proper operation. If not, poor fuel combustion could result. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home.
  • Page 6 FRESH AIR COMBUSTION VENTILATION Continued DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Determining if You Have a Confined or Unconfined Space Use this worksheet to determine if you have a confined or unconfined space. Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
  • Page 7 FRESH AIR COMBUSTION VENTILATION Continued 099569 VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must provide two permanent openings: one within 12" of the ceiling and one within 12"...
  • Page 8 FRESH AIR COMBUSTION VENTILATION Continued VENTILATION AIR (Continued) Ventilation Air From Outdoors Provide extra fresh air by using ventilation grills or ducts. You must provide two perma- nent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors.

  • Page 9: Installing To Wall

    INSTALLING TO WALL 099569 A qualified service person must install heater. Follow all local codes. CHECK GAS TYPE Use only natural gas. If your gas supply is not natural gas, do not install heater. Call dealer where you bought heater for proper type heater. INSTALLATION ITEMS Before installing heater, make sure you have the items listed below.
  • Page 10 INSTALLING TO WALL Continued WARNING ICON If you install the heater in a home garage • heater pilot and burner must be at least 18 inches above floor • locate heater where moving vehicle will not hit it For convenience and efficiency, install heater •...
  • Page 11 INSTALLING TO WALL Continued 099569 INSTALLING HEATER TO WALL Mounting Bracket The mounting bracket is located on back panel of heater. It has been taped there for shipping. Remove mounting bracket from back panel. Figure 6 - Bracket Location Removing Front Panel Of Heater 1.
  • Page 12 INSTALLING TO WALL Continued Marking Screw Locations 1. Tape mounting bracket to wall where heater will be located. Make sure mount- ing bracket is level. WARNING ICON G 001 Maintain minimum clearances shown in Figure 8. If you can, provide greater clearances from floor and joining wall.
  • Page 13 INSTALLING TO WALL Continued 099569 4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to “pop” open anchor wings. IMPORTANT: For thick walls (over 1/2" thick) or solid walls, do not pop open wings. Figure 10 - Popping Open Anchor Wings For Thin Walls 5.

  • Page 14: Connecting To Gas Supply

    CONNECTING TO GAS SUPPLY A qualified service person must connect heater to gas supply. Follow all local codes. WARNING ICON Never connect heater to private (non-utility) gas wells. This gas is commonly known as well-head gas. IMPORTANT : Check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water.

  • Page 15: Checking Gas Connections

    CONNECTING TO GAS SUPPLY Continued CHECKING CONNECTIONS 099569 IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings. Pressure Regulator 1/2" NPT Pipe Nipple Tee Joint Test Reducer Bushing to Gauge 1/8" NPT Connection * 1/8" NPT Plug Tap Tee Joint Sediment...
  • Page 16 CHECKING CONNECTIONS Continued 4. Check all joints of gas supply piping system. Apply mixture of liquid soap and water to gas joints. Bubbles forming show a leak. 5. Correct all leaks at once. Test Pressures Equal To or Less Than 1/2 PSIG 1.

  • Page 17: Operating Heater (Thermostat Models)

    OPERATING HEATER Thermostat Models 099569 FOR YOUR SAFETY READ BEFORE LIGHTING WARNING ICON G 001 If you do not follow these instructions exactly, a fire or explo- sion may result causing property damage, personal injury or loss of life. A. This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.
  • Page 18 OPERATING HEATER Thermostat Models Continued 4. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow “B” in the safety information at the top of page 17. If you don’t smell gas, go to the next step. 5.

  • Page 19: Thermostat Control Operation

    OPERATING HEATER Thermostat Models Continued 099569 TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1. Turn control knob clockwise 2. Turn off all electric power to the appliance if service is to be performed. Shutting Off Burner Only (pilot stays lit) 1.

  • Page 20: Operating Heater (Non-Thermostat Model)

    OPERATING HEATER Non-Thermostat Model FOR YOUR SAFETY READ BEFORE LIGHTING WARNING ICON G 001 If you do not follow these instructions exactly, a fire or explo- sion may result causing property damage, personal injury or loss of life. A. This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.
  • Page 21 OPERATING HEATER Non-Thermostat Model Continued 099569 4. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow “B” in the safety information at the top of page 20. If you don’t smell gas, go to the next step. 5.

  • Page 22: Inspecting Burner

    OPERATING HEATER Non-Thermostat Model Continued INSPECTING BURNER TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1. Turn control knob clockwise 2. Press in control knob and turn clockwise 3. Turn off all electric power to the appliance if service is to be performed. Shutting Off Burner Only (pilot stays lit) 1.
  • Page 23 INSPECTING BURNER Continued 099569 If pilot flame pattern is incorrect, as shown in Figure 21 • turn heater off (see To Turn Off Gas to Appliance, page 19 [thermostat models] or page 22 [non-thermostat model]) • see Troubleshooting, pages 24 through 27. BURNER FLAME PATTERN Figure 22 shows a correct burner flame pattern.

  • Page 24: Cleaning And Maintenance

    CLEANING MAINTENANCE TROUBLE- SHOOTING Note: All troubleshooting items are listed in order of operation. WARNING ICON G 001 Turn off heater and let cool before cleaning. WARNING ICON You must keep control areas, burner, and circulating air passage- ways of heater clean. Inspect these areas of heater before each use.
  • Page 25 TROUBLE- SHOOTING Continued 099569 OBSERVED POSSIBLE PROBLEM CAUSE When ignitor button 1. Gas supply turned off is pressed, there is or manual shutoff spark at ODS/pilot valve closed but no ignition 2. Control knob not in PILOT position 3. Control knob not pressed in while in PILOT position 4.
  • Page 26 TROUBLE- SHOOTING Continued OBSERVED POSSIBLE PROBLEM CAUSE Burner does not light 1. Burner orifice is after ODS/pilot is lit clogged 2. Burner orifice diameter is too small 3. Inlet gas pressure is too low Delayed ignition of 1. Manifold pressure is burner too low 2.
  • Page 27 TROUBLE- SHOOTING Continued 099569 WARNING ICON G 001 If you smell gas • Shut off gas supply. • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. •...

  • Page 28: Technical Service

    TECHNICAL SERVICE SPECIFICATIONS SERVICE HINTS SERVICE PUBLICATIONS You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323- 5190. 18,000 BTU/Hr Models B.T.U (Variable) 9,000/18,000 Type Gas Natural Only Ignition Piezo Pressure Regulator Setting 3"...

  • Page 29: Replacement Parts

    Parts Under Warranty Contact authorized dealers of this product. If they can’t supply original replacement part(s), either contact your nearest Parts Central (see below) or call DESA International’s Technical Service Department at 1-800-323-5190. When calling DESA International, have ready •...

  • Page 30: Accessories

    Purchase these heater accessories from your local dealer. If they can not supply these accessories, either contact your nearest Parts Central (see page 29) or call DESA International’s Parts Department at 1-800-972-7879 for information. You can also write to the address listed on the back page of this manual.

  • Page 31: Illustrated Parts List

    ILLUSTRATED PARTS LIST Manual Control 18,000 BTU/Hr Non- Thermostat Model (Parts list on page 33) 12-1 12-2 12 ODS/Pilot Assembly (Parts list on page 33) 099569...
  • Page 32 99569...

  • Page 33: Parts List

    PARTS LIST 18,000 BTU/Hr Non-Thermostat 098304-01 098742-03 — 098197-01 098342-01 098533-01AA 098260-01 098532-01AA M11084-26 098352-01BR 098271-02 098249-01 099440-05 12-1 098514-01 12-2 098515-01 099120-02 098517-01 098251-02 098250-01 098867-04 099553-01 098519-01 098298-03 — — — 098265-01 — — 098246-02 098529-01 097159-01 098508-01 M11084-26 M11084-38 099066-01...
  • Page 34 NOTES 099569...
  • Page 35 NOTES 099569...

  • Page 36: Warranty Information

    BLUE-FLAME VENT-FREE NATURAL GAS HEATERS DESA International warrants this product to be free from defects in materials and components for one (1) year from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions.

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